Hey Staceman,
thanks for the reply. When did you get your Gl-4 NAPA? the only Gl-4 NAPA brand i saw had, like i stated, Gl-3,and Gl-5 ratings included. Was it synthetic? Is "Gl-4 only" oil synthetic only?I havent been able to find any standard gear oil classed in "Gl-4 only" category... Thanks again